body {
  min-width: 320px;
  max-width: 750px;
  margin: 0 auto;
  background-color: #f2f4f7;
}
a {
  text-decoration: none;
  color: #707070;
}
@media screen and (min-width: 750px) {
  html {
    font-size: 37.5px !important;
  }
}
.header {
  height: 2.133333rem;
  border-bottom: 1px solid #eaeaea;
  text-align: center;
  line-height: 2.133333rem;
  font-size: 0.933333rem;
  color: #1c1c1c;
}
.nav {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.nav .item {
  margin: 1.466667rem auto;
  width: 6.72rem;
  height: 6.72rem;
  text-align: center;
}
.nav .item img {
  width: 100%;
  height: 100%;
}
